| Acronym | Meaning |
| NLLS | Nonlinear Least Squares |
| STIB | Stratosphere-Troposphere Interactions And The Biosphere |
| PMTDI | Provisional Maximum Tolerable Daily Intake |
| APXPS | Appearance Potential X-ray Photoemission Spectroscopy |
| NCSCI | National Center For Standards And Certification Information |
| UPTF | Upper Plenum Test Facility |
| SHM | Screened Hydrogenic Model (for Electronic Structure In Plasmas) |
| HPSAM | H-point Standard Additions Method |
| ICC | Interstitial Cells Of Cajal |
| SAXRD | Small-angle X-ray Diffraction |